Murphy B40 Receiver
A.P.57140/A/B/C/D
Was the main unit in Receiver Outfits CDW and CAQ fitted in H.M. Ships and R.N. Shore Wireless
Stations.

Five versions of this unit were in service, B40/A/B/C and D.
The
B40/D was suitable for FSK.
They had five ranges, giving continuous
coverage from 650 kc/s to 30 mc/s. Intermediate frequency - 500 kc/s.
This
unit weighs 114 lbs-51.7kg.

Stage 3 MixerEmploying a separate
oscillator which can be crystal controlled.
Fine adjustment of oscillator
is provided in the B40/D, the B40/D had the input circuit modified for
Common Aerial Working.

Manual and
Circuit
available
Details Below
On
Paper CD or DownloadClick Here

IF UnitA three position
band-width switch allows for IF pass bands of 8 kc/s (wide) and 3 kc/s
(narrow) in all units.
The third position of this switch incorporates an
audio note filter (band-pass 200 c/s, center frequency 1000c/s) in the
B40A; the 1 kc/s crystal band-pass filter is substituted in units B/C and
D.